Fire-door construction



R. C. MAHON FIRE noon CONSTRUCTION April 30, 1929.

Filed Feb, 14, 1927 ATTORNEY.

Patented Apr.' 30, 1929.

UNITED STATES PATENT OFFICE,

RUSSELL G. MAHON, OF DETROIT, MICHIGAN, ASSIGNOR TO THE R. C. MAHON COM- PANY, OF DETROIT, MICHIGAN A CORPORATION OF MICHIGAN.

FIRE-DOOR CONSTRUCTION.

Application filed. February 14, 1927. Serial No. 168,022.

This invention relates to fire door construction and-the object of the invention is to provide a fire proof door in which a glass panel is mounted and which is so constructed to prevent passage of fire from one room to another.

Another object of the invention is to provide a fire door in which the door frame is sheathed in metal and the glass panel is supported in metal so that no inflammable surface is exposed.

Another object of the invention is to provide a fire door in which the supporting members for the glass panel are concealed beneath a metal moulding which is secured to the door.

Another object of the invention is to provide a fire door in which the sheathing for the door frame is brought inwardly to provide a support for the glass panel.

These objects and the several novel features of the invention are hereinafter more fully described and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawing in which- Fig. 1 is an elevation of a fire door embodying my invention.

Fig. 2 is an enlarged section taken on line 2-2 of Fig. 1.

As shown in Figs. 1 and 2 the top and bottom rails and the stiles of the door are sheathed in a sheet metal casing 1. As shown in Fig. 2 the edges of the sheathing are brought out into the space for the door panel to provide a metal flange 2 consisting of a double thickness of the metal sheathing. A 16 gauge metal plate or strip 3 is spotwelded to this flan e and the spotwelding secures the two thic nesses of metal sheathing together thus making the flange 2 permanent and sealing the wood stiles and rails within the sheathing. The flange 2 and the strip 3 are provided with spaced apertures for the bolts 4 which are utilized to secure the glass panel 5 in the door. In order to secure this glass panel in place a removable metal filler strip 6 is provided which is apertured to receive the bolts 4 and a removable plate or strip 7 overlaps the edge of the glass panel 5 and is also apertured to receive the bolts 4. By tightening the bolts 4 the glass panel is held between the metal strip 7 and the sheathing flange 2 and the metal strip 3 is utilized to back up and stiflen the sheathing flange 2. When the door and panel have been assembled in this manner two sheet metal moulding strips 8 and 9 are positioned about the edge of the panel opening and are sweated to the adjacent parts of the door frame to conceal the panel supporting arrangement as will be readily nnderstod from Fig. 1. The glass panel 5 may be of any type of glass desired but is preferably a glass which resists breakage by heat such as a wire reinforced glass or a laminated glass panel. \Vith this arrangei'nent the wood frame of the door is entirely sheathed in metal and by spotwelding through the double thickness flange 2 the wooden door frame members are sealed from any possible contact with flame in case of fire.

From the foregoing description it becomes ing covering the rails and stiles, the edges of the sheathing being bent outwardly at a right angle and brought to parallel relation to provide a flange extending into the panel. space of the door, a stiffening strip fitting into the right angle bend on one side of the flange, the stiffening strip and parallel portions of the flange being spot welded together to maintain the right angle bend and close the sheathing, a clamping strip, a spacing member between the clamping strip and the said flange fitting into the right angle bend on the side of the flange opposite the stiffening strip, a glass panel ositioncd be tween the clamping strip and tlie said flange, the stiffening strip, flange, spacing member and clamping strip being provided with a series of apertures, a series of bolts extending through the said apertures and clamping the parallel flange portions between the spacing member and stiffening 'strip and clamping the glass panel between the flange and the clamping strip, a sheet metal moulding secured to one side of the door frame sheathin and concealing the clamping strip, and a sheet metal nniinlding seenretl te the ether sicle 0f the door frame sheathing and ceneaaling the stillei'iing strip Zilltl flange.

2. In a, fire (leer, a (leer frame formed of W()O(lIl ails and stiles, a sheet metal sheathing COVGl'll'lg the rails and, stiles, the ed ef the sheathing being bent entwarilly at a right angle and lnrenght to parallel relatien to provide a flange extending inte the panel space of the door, a stil'lening strip fitting into the right angle bend en one .s'itld e'lt the flange, the stiffening strip and parallel pertien of the flange bein; spet wehletl legwther to maintain the right angle llUllll and rlese the sheathing, a damping strip, a i-apaeingr member between. the rlainpinp; strip illltl the said flange fitting inte the right angle beml 0n the side of the flange eppesile the st' ing strip, a glass panel penitieneil between the ehnnping strip anal the saitl flange, the stiffening strip, flange, staining in niher ililll clamping); strip being pl'xlx ltlttl with a series of aperture and a series efl belts extending: through the said. aperlnree and i-lainpine; the parallel flange )ertiens between the spacing); member and stillening strip ainl elznnpin g the glass panel lml'ween the flange ainl the elainpii'w strip.

3. In a tire door, a deer framelerniell (it weetlen Rails and stiles, a sheet metal sheathing covering the rails and stiles, the edges e'l'i the sheathing being bmnght te the panel side of the door frame and bent outwardly at a right angle to parallel rela lien to 1 reville flange pUlftlOllS extending; inte the panel spaee et the (leer, a stillening strip titling lnte the rnght angle bend eel: ene flange, a, spacing member fitting; mte the right angle bend ef the other flange, the i=tillening strip anil sanl tlans s being; epet wehhwl legrl'her to seal the sheathing, a clamping strip engaging agaii ;t the spaeine; lnenibeii, a hflns i panel pesiliened between the elaniping l rip anti the 'll'lllgt, pertiens, and mean: lei hiinl ugly severing: the ehnnpii e; strip, anal ng nieinber tn the flange pertiens :nnl :liening ntl'ip.

at. Iln a lire (leer, a ilUUl' 'lranie illilllllfitl el n'emlen rails antl sl i a shirt inel'al siinalln in entering the rail:-: annl stiles, the Hilttll el the hnal hing being bent a t a right angle annl lnreught in parallel relatien lie priii'ille a flange extending: inle the panel spawn el the (leer, a ttili nning strip fitting inte the right ane'le hnnel en ene sitle eli the l'lannn, the 'ii ii "trip and para lel pertienai elf the Rt l i ELL Cl. MAHUN. 

